car seat help

I'm looking for a new carseat for my 4 yr old daughter. She is 36 pounds and fast approaching the weight limit on her 5 point harness (40#). What seats do you use that offer 5 point harness for over 40

Graco Nautilus? It harnesses until 65 lbs

Graco Nautilus and Argos. Nautilus harnesses to 65, Argos to 70. Then turn to boosters for like, 10lbs I think?
The new Harmony Defender 360 is available at Walmart only and harnesses to 65lbs for around $100.
The Britax Frontier 85 is awesome, harnesses to 85lbs and then boosters to 120lbs.

do you girls use any of them? i was just wondering how big and bulky they were and if they would fit ok in our corolla

We have the Nautilus. It's a little bulky IMO but not terrible. It's in our Jeep Patriot